Vision Test Chart and Method Using Gaussians.
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
Pagination or Media Count:
A novel vision test device and method for measuring the ability of a subject to perceive contrast is described, which comprises a chart for display to the subject having a plurality of visual test shapes systematically organized thereover in a predetermined array on a background of preselected luminance or reflectance level, each test shape having a preselected luminance level providing maximum contrast relative to background at its center and substantially zero contrast relative to background at its edges, the luminance or reflectance level of each test shape varying radially from its center outwardly according to Gaussian distribution of preselected distribution factor. Patents
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